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TIFFIN MOTORHOMES
To cool the motor home, the thermostat inside the Allegro is used—this is the same
thermostat which controls the furnace functions (described earlier). The air-conditioned,
cooled air is emitted through the vents which are located in the roof throughout the entire
coach. The discharge and return air vents run parallel, front to back, on the ceiling. Note that
the return vents are similar to the air conditioning vents. This system allows even distribution
for the returns instead of forcing an excess amount of return air through two smaller
openings. The even return system takes more of the hot air from the motor home, thereby
providing cooler air throughout the unit. The air conditioning vents that are mounted on the
ceiling are round vent filters
(Figure 3-5) that need to be periodically checked for dust accumulation. When
dust has accumulated on the filters, remove them and wash in a mild detergent
and warm water.
Thermostatic Controls
The following is a brief overview of how best to use the thermostat (Figure 3-6).
For more detailed instructions, please consult the thermostat literature in the Owner's
Information Package.
1. Move power switch to ON.
2. Depress the MODE button to select function. (COOL*, FURNACE, FAN ONLY, etc.)
3. Depress the FAN button to select fan speed or automatic operation.
4. Depress the UP or DOWN button to set your desired temperature for the zone.
5. If your vehicle contains more than one ZONE, depress the ZONE button to select Zone 2, and repeat
procedures from Step 2 above. Repeat procedure for each additional zone.
6. If your vehicle has two roof top air conditioners utilizing a 50 amp power cord, some restrictions may apply.
When only 30 amps are available, you most likely will have to turn off one of the two air conditioners to
prevent tripping the circuit breaker. Refer to Step 5, then Step 2, for shutting off the air conditioner in
your selected zone.
NOTE: If the Comfort Control is turned "off" or the thermostat loses power (i.e., power failure), the air-conditioning
system will resume operation at the last settings programmed into it when electrical power is restored.
Liquid Propane (LP) Tank
The Allegro is equipped with an ASME (American Society of Mechanical
Engineers)-approved LP tank (Figure 3-7) which is equipped with an automatic
pressure regulator. This tank contains liquid propane fuel under high pressure.
As this fuel passes through the main valve and through the regulator, it is
converted into a gas and its pressure is reduced to a safe level for use within the
motor home. A LP gas-distribution system distributes the gas to those
appliances using such in the motor home. The "heart" of this LP gas distribution
system is the regulator and that regulator should only be adjusted by a qualified
service technician. Most of the problems encountered in lighting the pilots of these
appliances are caused by regulator mis-adjustments.
!!!
–ALLEGRO®
Chapter 3
Figure 3-5. Liquid Propane Tank
HEATING & AIR CONDITIONING
Figure 3-2. Supply Vent
Figure 3-3. Round
Vent/Filter
Figure 3-4. Thermostat
3-4
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